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Pressure in a Tank 
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#1
Mar2514, 09:58 PM

P: 3

Hi all, I need some help with this question.
The final answer is 32.7kN but I have no idea what I'm doing cause I'm so lost in this fluid mechanics class right now. I attempted to calculate the pressure on the plate. P = pgh P = 1000*9.8*2 P = 19600 Pa Then I used F = P.A to get 78400N. I know this question has something to do with torque and resolving forces but I'm pretty sure I've already got it wrong. My lecturer provided me with this equation: y' = y + I_c/(y*A) and I_c is BH^3/12. Will I need to use this as well? Thanks in advance. :/ 


#2
Mar2614, 12:52 AM

P: 558

Your value for P is not correct. I would calculate the value of P at different points to see why this is the case.



#3
Mar2614, 02:02 AM

P: 3

Thank you for your reply. I've finally worked it out.
Using that y' equation, I worked out the location off y' and then determined the amount of torque it placed on the hinge. That then equates to 2*F and after a simple rearragement, I solved the question as we just needed to make F the subject. The value of H is actually 1.5m as I was meant to be looking at the centroid. Thanks for the tip :) 


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